ok i clayed the P to V
ok i clayed the P to V i couldnt wait for the springs to get here so i clayed. put the clay on the piston. put the head back on and snugged it down. turned the engine over two full times. pulled the head off and measured the clay with a depth micrometer. i got 135thousandths on the intake and exhaust. 
Originally Posted by Louis
What spring was in there? Flowbench style?
The proper way to check it is with an adjustable rocker set to zero Lash.
A standard Hyd. Roller has preload.
suppose that you have 40 thou of preload.
If you use a ballpoint pen spring ( kidding), or flowbench style spring, you get the preload that is supposed to be in the lifter, now in the valve, only multiplied by your rocker ratio. (1.7)
BEcause of this, you are starting with 40 thou * 1.7= ~ 70 thou that the valve is open. So starting with the valve 70 thou open, and you have 60 thou of clearance ( in reality), your motor will not turn over. OR, suppose you have 160 thou of clearance, you will now only have 100 thou.
Make sense?
If you use a hydraulic lifter and a standard spring, you will compress the lifter such that you will have more clearance, untill the lifter pumps up. ITs not much, but it sure puts a snag in the install.
Hope that helps
A standard Hyd. Roller has preload.
suppose that you have 40 thou of preload.
If you use a ballpoint pen spring ( kidding), or flowbench style spring, you get the preload that is supposed to be in the lifter, now in the valve, only multiplied by your rocker ratio. (1.7)
BEcause of this, you are starting with 40 thou * 1.7= ~ 70 thou that the valve is open. So starting with the valve 70 thou open, and you have 60 thou of clearance ( in reality), your motor will not turn over. OR, suppose you have 160 thou of clearance, you will now only have 100 thou.
Make sense?
If you use a hydraulic lifter and a standard spring, you will compress the lifter such that you will have more clearance, untill the lifter pumps up. ITs not much, but it sure puts a snag in the install.
Hope that helps
Originally Posted by gomer
I'd like to know too, I've used a heavy spring before and it has compressed the lifter some and given a P/V clearance that was MUCH different than when I used a "light" flowbench spring.
I used the light Moroso springs and it worked fine. The other thing you can do is get an old lifter and drill out the center, clean it out and fill it with epoxy or FastSteel. That way it won't collapse, but you have to use clay and for me measuring clay is not as precise as using a dial indicator.
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We use a hydraulic lifter that has been "gutted" and made solid to check p-v. We also check it with an adjustable rocker set to 0 lash. You can check coil bind very accurately this way too.
Mikey
Mikey
Originally Posted by Master Chief
what heads did you use, and what were they milled to, whas size intake/exhaust valves...and what lift on the cam
Last edited by pdd; Nov 21, 2004 at 03:08 PM.